J320A Unlock Fail

Operation: Unlock
Selected model: SM-J320A
Software version: 33.8

Waiting ADB device... OK
Reading phone info...
Model: SAMSUNG-SM-J320A
Android version: 6.0.1
PDA version: J320AUCU2APJ2
CSC version: J320AATT2APJ2
Phone version: J320AUCU2APJ2
Product code: SM2J320AZACATT
CSC country code: USA
CSC sales code: ATT
Phone SN: R28HC2CZYYJ
IMEI: 35741707xxxxx
HW version: REV1.0
RF cal date: 20161221
Chip name: EXYNOS3475
Modem board: SHANNON308
Security patch: 2016-10-01
Boot Warranty bit: 0
Checking Super user right... true
Reading NV data... OK
Checking NV data... OK
Initialization zTool... OK
Running zTool, please wait...
Start... OK
Initialization... OK
Generate and check client proof... OK
Verify proof by client... OK
Reading data from phone... OK
Modem board: SHANNON308
HWID: 57 31 7E 8C D1 FC 05 3B 61 3F BF 4A 69 0D 06 C3
Calculating... error
Security damaged (hmac mismatch)
Done with Samsung Tool PRO v.33.8


What means hmac mismatch? IMEI verified original, not altered or modified